www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.bugs - [Issue 6260] New: [Memory Corruption] Passed around lazy arguments don't work with closures

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6260

           Summary: [Memory Corruption] Passed around lazy arguments don't
                    work with closures
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: timon.gehr gmx.ch


--- Comment #0 from timon.gehr gmx.ch 2011-07-06 13:29:26 PDT ---
Tested in DMD 2.053:

auto foo(lazy int x){return {return x;};}
auto bar(lazy int x){return foo(x);}

void main(){assert(foo(1)()==bar(1)());} // assertion failure







Workaround:
auto foo(lazy int x){return {return x;};}
auto bar(lazy int x){return foo({return x;}());} // destroy purpose of 'lazy'

void main(){assert(foo(1)()==bar(1)());} // pass


Some funny stuff:
import std.stdio;
void main(){
    auto x=bar(1);
    writeln(x());
}

writes:
<Garbage integer value>
0

Where does "0" come from?

void main(){
    writeln(bar(1)());
}

writes:
<Garbage integer value>
Segmentation Fault

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
Jul 06 2011
parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=6260


timon.gehr gmx.ch changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #1 from timon.gehr gmx.ch 2011-12-28 09:53:56 PST ---
lazy arguments are implicitly scoped, so this is by design.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
Dec 28 2011